Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c4a3f02632e7779701b9de9e4ecf80428d8b32d269c53e4f053557e962cbe85' 
  AND token = 'z7zMMXEGe4u1vNb2cX8j43diybMvgEEBG4ga35CEY9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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