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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72a96c21a101d7c3068ff781039dcaae633825bfb7abdae852d8b549dbe4b43e' 
  AND token = 'k6VlePaZ0l6PbK0f3P8eQt8QWHuFL5O/XO4dXqqFeO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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