Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27e1abc445f89db755a7995599138ff2c65ba6fc6d4d3c8e388e65e39906ca52' 
  AND token = 'oGMjm1bu6Z+3v+y5fA1lrZMoEeOHsn4tCtZ2FUGKMXE=' 
  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"
    }
  }
}