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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e4131ae9a17df54a1643da486bc25b0efe19c6140038c3ab3a06ba173f7629' 
  AND token = 'Xjh9c7vy6hQ8ciCkZgDoDDM8qsQ+T+wKcTqJbwKS2l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}