Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc14a16b22da09730c655f1255a878c670e516907374c9f648386e77ba9b689c' 
  AND token = 'dINu7KQ895kxfAVV4wsNAZlzDST40sX5JZ1wejEkOTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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