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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35dbe13d603693ad2b53372371a43614a25b302277c4cd44938f9285bfebfe9f' 
  AND token = 'vRr+8MI3BAdENpflsWOGXB29khAI72T8pm398tWwuKY=' 
  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"
    }
  }
}