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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '558f409970c724e41da6ffa81805a24ab565d9158c1e292fe1b1aa12084aa5a5' 
  AND token = 'CJV6q6/lPtekjl95JCNyzDa0V2gARbtphwbamcw2+m8=' 
  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"
    }
  }
}