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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf4105d19c316b07d3060262104739531df893908e9a704425781f444e88d71c' 
  AND token = '0Mvobt3cciaDqzq0AtHG71N4RJ642QyA00LnlE+Yk9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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