Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '307b5f11f9add970a04a085a936f644900a22658c018c50550f1b2835f8ced33' 
  AND token = '3jh1kBLeJiqq8v98OI71bSaxRPhWm2r0Qsk6L9Jh/HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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