Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f62a238dd7bbca2b05ab070ba48b263b9522019e8479f69200f9bcd47506ab3' 
  AND token = 'VnLPTlK9Lh8BV7Wxz74SZIaaZC27mjvRJPZqPEJ8Bsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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