Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ae00893569b351cada8e02de1e38c57b5092e07f203c635034b598ad7931cd' 
  AND token = 'oo8E1LbSrsea3sCYLYaOUnrN0rOzR6Rz1YqSXxWjT1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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