Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '554c171c05c0ca49a68c98f919c5c4e3ae4e6afaa8c633dd500520f743940334' 
  AND token = '3lHVcaK0962pLttoKfLYVlbiwJKNvinABCHsZKIPVME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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