Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e963ce5d4af19827c663f54a5215be31cbf59ba0cc1b90bd4344280770a35b30' 
  AND token = '5fjNVGDQN31BIiIV1gTSbgAUq24JR5Hr+Cx42OMDotE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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