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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6db4bd87fa785fad7bf7b3fc75fd7c9c346c9281d78423d8698ea1ba6c3c2953' 
  AND token = 'IYVu6uYTyL7K6q9gC+GX2YeZaXtZdoAb+E0TTUOz4eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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