Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c71bed7240548de37dc02ce4c07ca0b1cdde3a09aef6845277f67209f275183' 
  AND token = '2ckqgo1fZhdL0ISnf/1jCWUDPrmRdK9hG6/oYJCph3g=' 
  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"
    }
  }
}