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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeca99c15d5608b7603b49debf4165971d8edb18b17592811034e4e6f506ca4d' 
  AND token = 'vwV1WF86hn1FwItS6RZ5CSZmOCitRgMAyJkvUCm23bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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