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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7494126e6acf5feb5468b6a11adcea7667c64af1a2daf14e0ef258779a778d2' 
  AND token = 'VEUgIg8YooF2WRswM8b6YpRoqw0uKhw5SpD+F/tS+ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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