Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff347e1f7e99cd6613486a9c41d8c5e880a3b75544a31d5596188599cd939cb1' 
  AND token = '9yYTLhC/W4UPfEbSsHll8Ljy9i9s75HB2N+JmIe9oyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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