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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12ba7becde265117101807271ee4e295018c515f5cdf74751290c85e837748b0' 
  AND token = 'ezSWV3a4Dkczbv/ogE8UXOwkPktpvY4YDp7WEBZwcOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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