SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0725844059e8626adc072cc71f59b500da364b08e67d7d3a584e9462c77b0ff' 
  AND token = 'H3wCsCNCh2YU/8PJBBi+wVfTGRfDAS1uUbXhtBghl5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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