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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40d2372d12bc2c16e0c49e4d35eadd307f0802ab7ea3094fa340f8052d6ccfb2' 
  AND token = 'nJTY2HdwUUI80Z0L4xviT5+3iFa2XldDISWl43SsX+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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