Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55bd5fde5bcc6ab48a0ae2ec0bad492cd465e8001fc7eedecf34ca9ef344ce7b' 
  AND token = 'AzVc0BJxnwxj23wMRQ/b9Bj2N2ke0PWFT7pAqYVkyu0=' 
  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"
    }
  }
}