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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ece4c08c73bdf0fd351f0b589541f8091696cd77547a05ffdc1c4e91b3b5b05f' 
  AND token = '8UcQYuA5uaKKVYEIxWV6UaUe5KmCLl0Yt8pp/hOl3WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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