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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfce9431078a797f67d2104078ed66cf1bf1e234c7c9414855af9645ae3d4250' 
  AND token = 'YTnvAmXGIQKg1Pqs6Yf5mECWMmE68994pJIj8qvutkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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