Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2f8b9fb30b57b0e171e7f13121c0c07517a378ac7a3c6fb54e88daed96f133b' 
  AND token = 'sItMeRNXgmL4i96opDQ1+tX+phtYQj9e4scdH+Xqp1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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