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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02071a08cf4efc551ce6611163422948335c3104fed0b7576c60d654ff5cb6ba' 
  AND token = 'Pl9OT9TylPjzip3twHOYA/lIgAIlzEydl03cUfQLsWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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