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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '711e78a8dbf67a1f5f106a2ab74f4e2ef86d0b835ffa193872232a1907e5a822' 
  AND token = '7KysJS0v7R616W/rmH5OaqyI8vQQ3J4UIB5yrCN0SuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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