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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf74da42d3aa542216252b19530c387b31fd86f6ee9c2e67c9d5bbf850b46cc' 
  AND token = 'RjONZHfr6QDMlFImb4TPZO0zhDNtaMJ/b7L+N6/7stU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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