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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67603148d5725216db819418376921c7a2dc44687c69868180025a954abefafe' 
  AND token = '3vcu5FTsG2oGkRTJx2picggLZoC/vazVc4CvL08OLCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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