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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bcaa9f9c421550198e1c38b19cb580db7351eb31064fce27e928600323f4604' 
  AND token = 'gndSIoQO7fnHADG98H9Hka6nJjs83lX76GQu11dtug8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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