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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae7d455e4f1101ea19cbe973e5e35ecd7bfb5b9e74731e28edacad0a838f45c' 
  AND token = 'ecdphji3HwETV7cAK8EsxmKTk+2yKwtyJfazM7Q0BkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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