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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feefed9b362abed344cb1d506a80255ccf49776d404b8620b9eab5644e79d656' 
  AND token = 'yzms+MNOycJ9yn5WZiYg02uFEU2W7q2IAZEepEbqgV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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