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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9b55b89aba29d0db642fda4021d3fd5e46097d800ef00ce12775937a92ba48d' 
  AND token = 'uocGagNim2do4HxE/h5lpryuw6UDmi/Z4W3l/1HhFRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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