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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd876392566fbe9f275da2f8c84d79ed5e850b8ba42326e70deea80377599be' 
  AND token = 'ac7KO9F3XNoig1iaKFSo50hE66PKoCiWaVs0M6k6NZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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