Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6bbac8f2014b964a93daf4c8c30e7663657ace9be168b29916d491e65fd4416' 
  AND token = '0Kxn2ga28kCvh7EsUrSHKI3WTKj9CDzNINB//ae1eTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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