Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bfa10b1a7c873789174b9d2a0ab55a6772dc45bba101a33168b2bc9092c2e35' 
  AND token = 'ut824+aYb/Z7z8/1q9fzEz+Mj8v5GchndCZql/vCrjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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