Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68630e314a289dd440d111d0e61f23213e10666da1e5caa11ad83d863c7975fa' 
  AND token = 'Vlx190hjmGUicn2IZ0Jby5HWoUcSXfSJ9OA/ogs43xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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