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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d021cb50b1714f1ce04ee2c3112bce7eb8625420a9e06709bb9cc179cb4cd25' 
  AND token = 'gkeiX6NKv50GBFsZWI4weH/M5Dlxb4WaQ36tPyo7PK8=' 
  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"
    }
  }
}