SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae5c3b3c358b06766cf94636d310a7931d682735d615881948ef9d87547402e' 
  AND token = 'VQsYic7GzI/BT5XUt4zDLCpWyL3l2EcYNMkSw+OiQlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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