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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e6aea4686adac3d077d880a22f9053389b02d753da5a896e023da991b538db' 
  AND token = 'JInvclrzr8Vw1ILTym579Zn07iGo6+nB+IKLCvXSs64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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