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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da21bd511d1d9f86f6bfec6b7c022f44e1bfd4439079b777d719c4ef12577d9e' 
  AND token = 'U8THCiOaK4gLbESy4KfXrfJUDJlqp3ZoEh9aQY5K70Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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