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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9754c8a009424a31b36be421bb828cd3cdab10187e05f0184dd6f1f6a7525bc8' 
  AND token = 'd+X5NW3xUAC+XHKH1S6jeSlfH255bmpVNrhGKcP90bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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