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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '124024ab14f767e20d96d0a8bb52cfb06aae0d216e3f2543cf88a56776c5fc84' 
  AND token = 'DgHcKY7XJ7XZGQlM8N4v37nVEt+O/UrX+68KfiFo0o0=' 
  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"
    }
  }
}