Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acfecdd34443f74ae2fcb3cd00ee2b7dce1333fe4d963f3f5d8bd208ba38e3c4' 
  AND token = 'Yqg2A/IY7Ar0tZLmCfTuEXSLfOSfAYgsI2RYniiw3FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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