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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '716c60567638fcbb770c79b7e20dfbccad43b048f6b619d9d00a10802b029c19' 
  AND token = '9mV005tmTy0BVvhLjcblHhOADTk0ZGZ8fAZAeXGfxHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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