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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7b8e5aa6f48c736ada4a7a913086170f399de98ed8ed8d762c4cdc10a01caf4' 
  AND token = '94CUvYFrTzKAW9nbIUL7H3LTtn9Rii5C+mPwr1GDwME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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