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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f49cac0aa731da76e4f60519908c26393a696cffce1d14977cb1e2c3cde14474' 
  AND token = 'vtFIAMyxTHm4MYKRs36ZUcqO/XY8jvE9TFaZjb4groA=' 
  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"
    }
  }
}