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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ca7013355804c763b7e97ca363f86ad8c5b0cab87102ab4719606a615c8bac' 
  AND token = 'TxAcAe9j4g43D/iY2ONiFziQKA8zlx+ywgCsDfLo7Vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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