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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '814aa5dc9c45c9d7b13f345c9013ce99ae658ce718cbdba2fd6f3cb3eb6af8b1' 
  AND token = 'LvJX7T3uduh0lPZ44z8rW5PNbDrT80yhdaRTD6T/DGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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