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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da4e0c2de905c4201665456e2e18fdbc80eca8d654d64a8e47c8e834a65881e2' 
  AND token = 'LYtZp43pCx4iRaIEdgSBDeuDJY9ErOaX2KTmlE8ywqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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