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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b985a3f7b5f6f51617366d85de83b52d070c9770fff9c9cd3d358ad790b41b3' 
  AND token = '8W6x1wfU/QO8Aa8OXiSvUrHxtT1swgo0kWgqwGETg7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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