SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a07e3587da28a019f7d0596810b452b478078e4c1d9c27a6bef87435fa2a6c27' 
  AND token = 'ayLF/qjjI9V0+dSnv0vDPYVhq4KMAVAnE4ofXuSOwU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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