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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e4f0b98cfe62b730b12a5235099371c3e263d24536826941f6d91642d4e5a6' 
  AND token = 'ZMh1HAWX4riZ+4pdpDP4qu5zHBt+ZuENB0bFciw0nmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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