SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00e070d2994062aeb73f697a42ab2e8537c12978882f7ac1897b5c0a987cda6d' 
  AND token = 'wxUqhWUsJVktIXk/MgjEc+xKg3o1IPsAJlgF3L1mEYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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