SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c441a562ef6c0f316952136dabc0897655e593b38329cdf58a850f6dddfa7d5' 
  AND token = 'hlQB404y0sXTAuNWR0YCAgpllgoM+vKAbqhpFMtwGQA=' 
  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"
    }
  }
}