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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2266beb78be5c4c0372fdf6a48ef44555740bf188af867427637486ba96f45f7' 
  AND token = 'kP18luube3uo0HE0Ur+oe7UPp4PCn4G0yXEo5zor+Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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