SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bcebb9f76c7cca801853b08a21a438169df3a1407e5aeb3abc53d635616120a' 
  AND token = 'NU6+5lqg3ljy1txKQUZ/m68MrU+9ZWBYDSLGASVLXEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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