SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfda7aac7926cd8e1f3267eb22a76cbacf5bf5fa6273d46438f902fc415062e0' 
  AND token = 'N0bhDEqZ+U9BYI3dQ+/K3GlQ3yT0aLwquIGSTOPVaTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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