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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44342d13f8418ed6e10af52771f3bb44cf87d9f4a3d41024911ae9dcb8e2dd99' 
  AND token = 'Ob2G2zIDM0PXEtUWdaDqlX5YOxdpxO9WvN6yXqD631s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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