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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2844b28ee1c6a9beb7ac2111ced9db92c33332067741db4f6b32fb1d0db3145c' 
  AND token = 'D71/jyg+paIl71N3c16iQl4UWwXRV+/TgzQp1ej6Qdg=' 
  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"
    }
  }
}