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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dfd724630483b04c4ca040223bdae7380e2c158c6ff0059c705fa4e64274266' 
  AND token = '9848k6AbosckNnL6azDR9GTQs6IGBbq0K4y7GN3QD18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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