SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a4cc795265666b1a16cb76a9536fd79ffb19c05bc83a31298a9aa477738141d' 
  AND token = 'IYM7qJCGcYJailjQGSblBTe/mr61LgitMQoq+WZ69/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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