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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc192d40de77919622f56a37a55566db7ef5e5ae5296cc21fe62ee041cff0ff9' 
  AND token = 'I7Fi2xswkaQUACrg+L4Cs+OXdR3xYHca6GIgVXixfd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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