SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41c090639e8826936f301b589df4a0edbff0784aa29dc956ad65ba1b0d1ea539' 
  AND token = 'y1NdmeHcEIGFq1z7u1PjZzAVG+Dm/GLNCKdhu/RKDvg=' 
  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"
    }
  }
}